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152 lines
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original version by: Nikos Drakos, CBLU, University of Leeds
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<H2><A NAME="SECTION00083000000000000000">
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psb_exit -- Exit from PSBLAS parallel
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environment</A>
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</H2>
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<P>
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<PRE>
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call psb_exit(icontxt)
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call psb_exit(icontxt,close)
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</PRE>
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<P>
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This subroutine exits from the PSBLAS parallel virtual machine.
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Synchronous.
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</DD>
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<DT><STRONG><B>On Entry </B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>icontxt</STRONG></DT>
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<DD>the communication context identifying the virtual
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parallel machine.
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<BR>
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Scope: <B>global</B>.
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<BR>
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Type: <B>required</B>.
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: an integer variable.
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</DD>
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<DT><STRONG>close</STRONG></DT>
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<DD>Whether to close all data structures related to the
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virtual parallel machine, besides those associated with icontxt.
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<BR>
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Scope: <B>global</B>.
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<BR>
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Type: <B>optional</B>.
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: a logical variable, default value: true.
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</DD>
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</DL>
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<P>
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<FONT SIZE="+1"><B>Notes</B></FONT>
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<OL>
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<LI>This routine may be called even if a previous call to
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<code>psb_info</code> has returned with <IMG
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WIDTH="73" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
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SRC="img128.png"
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ALT="$iam=-1$">; indeed, it it is the only
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routine that may be called with argument <code>icontxt</code> in this
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situation.
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</LI>
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<LI>A call to this routine with <code>close=.true.</code> implies a call
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to <code>MPI_Finalize</code>, after which no parallel routine may be called.
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</LI>
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<LI>If the user whishes to use multiple communication contexts in the
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same program, or to enter and exit multiple times into the parallel
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environment, this routine may be called to
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selectively close the contexts with <code>close=.false.</code>, while on
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the last call it should be called with <code>close=.true.</code> to
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shutdown in a clean way the entire parallel environment.
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</LI>
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